Groundwater quality data from the National Water-Quality Assessment Project, May 2012 through December 2013

Abstract

Map showing study area and wells sampled as part of the Georgia-Florida urban land-use study network (gafllusrc1) near Tampa, Florida, for the U.S. Geological Survey National Water-Quality Assessment Project, July through November 2012 ......18 12. Map showing study area and wells sampled as part of the Nevada Basin and Range urban land use study network (nvbrlusrc1) near Reno and Carson City, Nevada, for the U.

The triple argon isotope composition of groundwater on ten-thousand-year timescales

“…Nonetheless, because 4 He and 14 C data exist from past U.S. Geological Survey measurements (Arnold et al, 2018(Arnold et al, , 2016, we briefly discuss the correspondence between Δ 40 Ar and these two groundwater age tracers. Using measured Ne, Ar, Kr, and Xe data and the PANGA software (Jung and Aeschbach, 2018), we determine the expected non-radiogenic 4 He concentrations (i.e., from air-saturated water and excess air) by assuming a recharge elevation of 1100 m (Kulongoski et al, 2009) and J o u r n a l P r e -p r o o f by employing the Closed-system Equilibration (CE) model (Aeschbach-Hertig et al, 2000).…”

“…All samples were collected after J o u r n a l P r e -p r o o f flushing three casing volumes from each well. For additional important context in interpreting these Ar isotope data, we include previous measurements of other key geochemical parameters in samples collected from each of these 36 wells by the USGS, following standard USGS groundwater sampling protocols (Arnold et al, 2018(Arnold et al, , 2016. For these additional data, the carbon isotopic composition of DIC was analyzed at the Woods Hole Oceanographic Institution National Ocean Sciences Accelerator Mass Spectrometry lab (Roberts et al, 2010); major and trace elements were measured via ICPMS/AES, AAS, and ion chromatography at the USGS National Water Quality lab (Fishman, 1993;Garbarino et al, 2006); water isotopes at the USGS Reston Stable Isotope Lab (Revesz et al, 2009); tritium at the USGS Menlo Park Tritium Lab (Oestlund and Dorsey, 1977); and noble gas abundances (for the Mojave Desert samples only) at USGS Denver Noble Gas Laboratory (Hunt, 2015).…”

Water Quality of groundwater used for public supply in principal aquifers of the western United States

“…The understanding assessment methods include a description of the treatment of concentrations below method detection limits (MDL) and the statistical methods used to identify significant correlations between potential explanatory factors and selected water-quality constituents. [2013][2014][2015][2016][2017]; and B, sub-provinces of the Columbia Plateaus regional aquifer system.…”

“…Abbreviation: SMCL, secondary maximum contaminant level] Detection frequency and aquifer-scale proportions (low, moderate, or high concentrations) for inorganic constituents that met criteria for additional evaluation by the status assessment for the Basin and Range basin-fill aquifers sampled by the U.S. Geological Survey National Water-Quality Assessment Project,[2013][2014][2015][2016][2017]. Detection frequency and aquifer-scale proportions (low, moderate, or high concentrations) for inorganic constituents that met criteria for additional evaluation by the status assessment for the Rio Grande aquifer system sampled by the U.S. Geological Survey National Water-Quality Assessment Project,[2013][2014][2015][2016][2017]. Detection frequency and aquifer-scale proportions (low, moderate, or high concentrations) for inorganic constituents that met criteria for additional evaluation by the status assessment for the High Plains aquifer sampled by the U.S. Geological Survey National Water-Quality Assessment Project, 2013-2017.…”

Groundwater residence time estimates obscured by anthropogenic carbonate

“…The wells selected for this study were sampled either as a part of this work or in previous U.S. Geological Survey (USGS) groundwater measurement programs (54). Groundwater samples were collected following standard USGS protocols and analyzed at USGS and other laboratories using established analytical methods (55) as part of the USGS National Water-Quality Assessment Enhanced Trends Network program (54). The carbon isotopic composition of DIC was analyzed at the Woods Hole Oceanographic Institution National Ocean Sciences Accelerator Mass Spectrometry laboratory (56); major and trace elements were measured via inductively coupled plasma mass spectrometry/atomic emission spectroscopy, atomic absorption spectroscopy, and ion chromatography at the USGS National Water Quality Laboratory (57,58); water isotopes at the USGS Reston Stable Isotope Laboratory ( 59); tritium at the USGS Menlo Park Tritium Laboratory (60); and noble gasses at USGS Denver Noble Gas Laboratory (61).…”